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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Strong Shoulders. The spring chest expander works the deltoids as the primary muscle for the movement. There are three primary sections to your deltoids, or shoulder muscles, anterior or front, middle and posterior or back.road Back. The basic exercise of the spring chest expander also engages the upper back muscles. The pulling action requires the upper back to engage. To get more back flexion out of this exercise, squeeze your shoulder blades toward each other as you pull the chest expander outward.